甘肃黑方台黄土边坡稳定性的可靠度分析  

ANALYSIS ON LOESS SLOPE STABILITY OF HEIFANGTAI,GANSU PRO-VINCE

作　　者：陈春利[1] 邢鲜丽[1] 李萍[1] 李同录[1] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054

出　　处：《工程地质学报》2011年第4期550-554,共5页Journal of Engineering Geology

基　　金：国家自然科学基金项目(40772181和40972182)资助

摘　　要：在对黑方台地区的黄土进行3种含水率条件下的直接剪切试验和重塑土的反复剪切试验,并收集该区地层力学参数,利用21组实测边坡的坡高坡度建立地质模型,采用Monte Carlo法进行边坡可靠度分析,结果表明:该区黄土黏聚力基本为零,边坡稳定性与坡度显著相关,以5%作为可接受概率,则边坡稳定坡度为27.2°。对于坡度大于27.2°的边坡,宜做防护或改善地下水坏境等措施。A geological model is established for loess slopes in Heifangtai in Gansu Province It is based on the direct shear tests and the repeated direct shear tests of Heifangtai loess soils.It also collects the physical character and shear strength of soil,and the height and angle of 21 slopes at Heifangtai.The failure probability of the slopes were calculated by the Monte-Carlo method.The results show that cohesion of loess in Heifangtai is nearly zero,and the probability of the slopes is correlated with the angle of slope.If 5%is acceptable probability,the stable angle of slope is 27.2°.The slope with angle more than 27.2°needs to be protected as soon as possible.

关 键 词：黑方台 黄土 边坡 滑坡 MONTE Carlo法 可靠度 失效概率 

分 类 号：TU43[建筑科学—岩土工程]